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Finding the Fourth Proportional to 99.66, 137.56 and 60.84

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Solution

The fourth proportional to 99.66, 137.56 and 60.84 is: 83.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.66 : 137.56 = 60.84 : x
  2. Step 2: Convert to fraction form
    99.66/137.56 = 60.84/x
  3. Step 3: Cross multiply
    99.66x = 137.56 × 60.84
  4. Step 4: Simplify right side
    99.66x = 8,369.15
  5. Step 5: Solve for x
    x = 8,369.15/99.66
  6. Step 6: Final answer
    x = 83.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.